doc(readme): add thanks to the PostgREST project
doc(readme): add thanks to the PostgREST project

postgraphql/postgraphql,calebmer/postgraphql,nbushak/postgraphql,postgraphql/postgraphql,postgraphql/postgraphql,nbushak/postgraphql,calebmer/postgraphql,ferdinandsalis/postgraphql,postgraphql/postgraphql,nbushak/postgraphql,calebmer/postgraphql,nbushak/postgraphql,ferdinandsalis/postgraphql,calebmer/postgraphql